Well, it looks like "something" got caught in the trigger guard. That may be why he was attempting to adjust the gun in the holster if he was trying to free whatever was stuck in there. On the other hand, it could be he may have inadvertently put his hand on the grip and pressed the trigger while adjusting.
- Ceicei
I've never owned a Taurus but I see it is listed as an DA/SA so is it possible to carry it in SA mode with the hammer back and no safety on?